<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        var o = {
            name: "张三",
            age: 18,
            gender: "男"
        }
        //遍历对象使用是for in语法
        
            // console.log(key, o);
            console.log(o["name"])
           
      
    </script>
</body>

</html>